Sand-blast-feeding machine



Apil 2s, 1925-.. 1,535,939

R. H. MOORE v SAND BLAST FEEDING MACHINE Filed July 5. 1922 Zh V571 for' Pagina/2d hf' Moore Patented Apr. 28, 1925.

` UNITED STATES PATENT OFFICE.

RAYMOND H. MOORE, OF CHICAGO, ILLINOIS, ASSIGNOR TO THE AMERICAN FOUNDRY EQUIPMENT." COMPANY, OF NEW YORK, N. Y., A CORPORATION 0F OHIO.

SAND-BLAST-FEEDING MACHINE.

Application filed July 3,

To all whom 'it may concern:

Beit known that I, RAYMOND I-I. MOORE, a citizen ot the United States, residing at Cl'iicago, in the county of Cook and State of Illinois, have invented a certain new and useful Improvement in Sand-Blast-Feeding Machines, of which the following is a full, clear, concise, and exact description, reference being had to the accompanying drawings, forming a partof this speciiication.

My invention relates to a sand blast feeding machine, and particularly to an im! proved means `for discharging sand Jfrom the -supply tank and feeding the sand to the pipe leading to the discharge nozzle.

@ne of the objects of the invention is to provide a simple, practical` and Veffective mixing chamber.

Another Object of the invention is to provide means for impelling the sand under air pressure into the mixing chamber.

Another object of the invention is to control by air pressure the flow of sand into the mixing chamber.

Another obj ect of the invention is to impel by means of an auxiliary air current, the sand into air currents converging centrally in the mixing chamber so that the impelled sand is thoroughly mixed with the air in the mixing chamber.

In the accompanying drawings Fig. l is an elevational view of a sand tank equipped with the device of my invention;

Fig. 2 is a vertical section of the device on an enlarged scale;

Fig. 3 is a horizontal section of the device on line 3 3 of Fig. 2.

Referring to the drawings, I show a sand supply tank l, the upper end of which' is equipped with the usual valves vand pipev connection-s of such apparatus, but as they form no part of this invention a detailed description of the same is omitted.

Tank l has a concave bottom provided with a central opening 2 into which the sand outlet pipe 3 is threaded. A horizontal or substantially horizontal pipe is secured to lower end of pipe 3 and receives sand from same. The sand in interior of pipe 4 accu` mulates in a pipe 5 in the manner shown in 1922. Serial No. 572,452.

Fig. 2. Pipe t is of such length, however, that sand will not roll out of open end of pipe 5, when the device is inactive. A tubular member 5 surrounds lower end of nection 8 with a discharge pipe 9. Another air inlet pipe l() is secured to member 5, at the side of same.

Chamber 6 is substantially larger than the pipe t so that air from pipe 10 has room for free distribution around pipe 4E, and to converge and to leave chamber 6 through pipe 9 as a current of uniform velocity. A valve ll operates to control the iiow of air through pipe 7, which latter, as well as pipe lO, is connected to a source of compressed air.

To operate the device air is first caused to flow through pipes 7 and 10 by controlling means which form no part of this invention and'which are not shown and described. By opening valve 1l the sand is driven as desired into the mixing chamber 6 and the amount so driven is controlled by regulating the valve l1. Sand and air thus projected into chamber 6 commingle with air coming -into same through pipe lO, the whole forming a sand blast which is discharged through discharge pipe 9, to the end of which is connected a sand blast nozzle of any desired or usual type.

Thus it will. be see-n that the sand pipe i forms a trap or holder for the sand, making unnecessary any valve or stricture for same when device is inactive; and at the same time, said pipe affords a free and Open channel for the air and sand when the device is in use.

It will be understood that changes and modifications may be made without departing Jfrom the spirit of the invention.

What I claim is:

In sand blast apparatus, the combination of a supply tank, a sand outlet pipe extending downwardly from said tank, a horizontal `sand and air pipe of like dimension connected with said downwardly extending pipe and receiving sand therefrom, said horizontal pipe having an open end portion projecting beyond said downwardly extending pipe suiiioiently to prevent sand from falling out of the open end of said portion by gravity and having a compressed air connection of llke dimension, and a Coin- 

